Molding-machine.



W. OGONNOR.

MOLDING MACHINE.

APPLICATION FILED MAR. l, 1909.

Patented May 3, 1910.

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W. OGONNOR.'

MOLDING MACHINE.

APPLICATION IILIVZD MAR. I, 1909.

Patented May 3, .1910.

2 SHEETS-SHEET 2.

lg a I 4'45 UNITED STATES PATEN FFTE WILLIAM ocomvon, or SMITH, MICHIGAN.

MOLDING-MACHINE.

To all whom it may concern:

Be it known that I, WILLIAM OOoNNoR, a citizen of the United States, residing .at Smith, in the county of St. Clair and State of Michigan, have invented a new and useful Molding-Machine, of which the following is a specification.

This invention relates to machines for molding sewer pipes, culverts, drains and the like from cement, concrete and similar plastic material and has for its object to provide a strong, durable and thoroughly efficient machine of this character by means of which artificial stone sewer pipes may be economically and expeditiously manufactured.

A further object is to provide a molding machine including a revolving table upon which is supported the mold or form, means being provided for feeding the concrete to the mold, while the table is in motion.

A further object is to provide a novel form of tamping mechanism by which the material in the mold may be uniformly tamped and solidified.

A further object is to so arrange the tamping element that the latter will always tamp the concrete in the mold regardless of the height or quantity of material in said mold.

A still further object of the invention is generally to improve this class of devices so as to increase their utility, durability and efiiciency.

Further objects and advantages will appear in the following description, it being understood that various changes in form, proportions and minor details of construction may be resorted to within the scope of the appended claims.

In the accompanying drawings forming a part of this specification :-Figure 1 is a side elevation of a molding machine constructed in accordance with my invention. Fig. 2 is a top plan view of the same. Fig. 3 is a front elevation showing the tamping element in elevated or inoperative position. Fig. at is a front elevation of a portion of the machine showing the locking pawls released and the tamping element in lowered or operative position. Fig. 5 is a detail perspective view of the mechanism for rotating the revolving table. Fig. 6 is a detail side elevation of a portion of Fig. 4:. Fig. 7 is a detail perspective view of one end of the op- Specifieation of Letters Patent.

Application filed March 1, 1909.

Patented May 3, 1910. Serial No. 480,540.

eratin shaft, showing the manner of mounting the toothed disk and crank wheel thereon.

The improved molding machine forming the subject matter of the present invention includes a supporting base 5 having a ver tically disposed frame 6 secured thereto in spaced relation to one end of the base, said frame comprising spaced standards 7 connected by one or more transverse beams 8 and 9. Mounted for rotation on the extension 10 of the base is a table or mold-carrier 11, the latter being preferably circular in form and provided with peripheral ratchet teeth 12. Supported on the table 11 is an outer shell or member 13 and spaced from said outer shell by a substantially flat ring 14 is an inner shell 15, thereby forming between said shells an intermediate compartment for the reception of the cement, concrete or other material constituting the body of the sewer pipe or culvert. The outer mold section or shell 13 may be retained in position on the table 11 in any suitable manner, and in the present instance a pair of spring clamping arms 16 are provided each havin its lower end secured to the table 11 and its upper end arranged to yieldably engage the exterior wall of the shell 13. The lower end of the inner shell 15 is centered on the table 11 by the spacing member or ring 14, as before stated while the upper end thereof is supported against lateral movement by a bail or yoke 17 having its opposite ends secured to the uprights 7 and 8 and its intermediate portion extending laterally over the top of the inner shell 13, as best shown in Fig. 1 of the drawings.

J ournaled in suitable bearings 19 secured to the supporting base 5 is a main operating shaft 20 having its inner end provided with spaced disks 21 and 22, the disk 21 being formed with a plurality of teeth 23 arranged to engage a rack 24: carried by a sliding plate 25 disposed at the rear of the rotary table 11. The plate 25 is slidably mounted in suitable keepers 26 secured to the upper surface of the base 5 and interposed between the plate 25 and the base 5 is a stationary plate 27 which serves to receive the wear incident to reciprocation of the upper plate on the supporting base. Pivotally mounted at 28 on the sliding plate 25 is a pawl 29 adapted to engage the teeth on the rotatmg table 11 and revolve the latter the distance of one tooth at each movement of the plate 25, said pawl being normally and yieldably supported in engagement with the teeth 12 by means of a leaf spring 30, one end of which is secured to a boss or lug 31 carried by the plate 25, while the opposite end thereof bears against the adjacent face of the pawl 29, as best shown in Fig. 5 of the drawing. As a means for automatically returning the plate 25 to retracted position after each forward movement of said plate there is provided a spring 32 mounted on the supporting base 5 and having one end thereof bent to produce a coil 33 and its opposite end bent laterally to form a depending finger 3st arranged to enter one of a series of notches 35 formed in one longitudinal edge of the sliding plate Thus it will be seen that at each revolution of the main operat ing shaft 20 the teeth 23 on the disk 21 will engage the rack 2st and slide the plate 25 longitudinally on the plate 27 thus causing the pawl 29 to engage the teeth on the table and rotate the latter in the manner before stated.

The material is fed to the molding compartment from a feed-trough 36 arranged at the rear of the revolving table and preferably in the form of a semi-circular casing supported in a substantially horizontal plane on a frame 37, and having its forward end open and arranged to discharge into the compartmentof the mold.

J ournaled in suitable bearings formed in the trough 36 is a feed-screw or worm 38 having one end thereof extended longitudinally beyond the adjacent end wall of the trough to form a stub shaft upon which is keyed a pulley 39, the latter being connected with av similar pulley at) on the main operating shaft 20 through the medium of a belt 4:1 so that rotary movement imparted to the shaft 21 will be transmitted to the screw 38, thereby to feed the concrete, cement or other material to the molding compartment.

The main operating shaft may be provided with a terminal hand-crank 42 for operating the machine manually but in some cases it is desirable to have the same operated by some extraneous power and for this purpose a pulley 4:3 is secured to the shaft 20 for connection through the medium of a belt to an engine, motor or other source of power.

The means employed for tamping the material within the molding compartment during rotation of the mold comprises a vertically movable carriage at including spaced longitudinally disposed bars a5 connected by transverse plates 46, said plates being spaced apart by suitable blocks or strips 47.

Slidably mounted for vertical movement between the longitudinal strips 45 of the carriage is a tamping element or plunger as having its opposite longitudinal edges provided with teeth or serrations 4:9 and its lower end formed with an enlarged head 50 arranged to enter the molding compartment and uniformly tamp the material therein during the rotation of the table.

Pivotally mounted at 51 between the plates 5L6 are oppositely disposed pawls 52, the active ends of which are normally and yieldably supported in engagement with the teeth 4.9 of the rack by means of suittble springs 53, one end of each of which is secured to a pin or supportbetween the plates 46, while the opposite ends of said springs bear against the adjacentextension 5a of the pawl, as best shown in Fig. a of the drawings. As a means for automatically disengaging the pawls 52 from contact with the teeth on the tamping element thus to allow the latter to drop by gravity within the compartment, there is provided a pair of downwardly inclined stops 55 arranged in the path of movement of the pawls 54; and which tilt the pawls laterally when the carriage ll is moved to elevated position.

Extending laterally from one of the plates at is a pin 55 to which is connected one end of a pitman 56, the opposite end of said pitman being connected to a pin on the crank disk 22.

The teeth 49 of the tamping element 48 project laterally beyond the adjacent longitudinal edges of said tamping element and enter guiding recesses 57 formed in the transverse bars 8 and 9, thereby to assist in guiding the tamping element in its vertical movement.

The operation of the device is as follows :A quantity of cement, concrete or other plastic material is introduced within the hopper or trough 36 after which the main operating shaft 20 is rotated which revolves the table carrying the mold with a step by step movement and at the same time feeds the material from said trough into the molding compartment. At each revolution of the shaft 20 the carriage as is moved upwardly between the beams 8 and 9 carrying with it a tamping element 48. When the pawls 52 come in contact with the stops 55, said pawls are automatically disengaged from the teeth on the tamping element, thus permitting the latter to drop by gravity and tamp the material within the molding compartment.

Attention is here called to the fact that the table remains stationary during the impact of the tamping element and that on the upward movement of saidtamping element, said table is partially rotated so as to present a. new surface to the tamping element when the latter again descends within the molding compartment.

Having thus described the invention what is claimed is 1. A molding machine including a supporting base, a mold supporting table mounted for rotation on the base, a tamping element movable to operative position within the mold, while the latter is in a state of rest, means for feeding material to said mold, a plate slidably mounted on the base, a pawl carried by the plate and adapted to engage the teeth on the table to rotate the latter with a step by step movement, a rack carried by the plate, an operating shaft, a connection between the operating shaft and tamping element, and a toothed disk carried by the shaft and adapted to engage the rack on the plate for reciprocating the latter.

2. A molding machine including a supporting base, a mold supporting table mounted for rotation on the base with a stepby-step movement and provided with peripheral teeth, a tamping element movable to operative position within the mold, dur ing each period of rest of said mold a spring pressed plate slidably mounted on the base, a pawl carried by said plate and adapted to engage the teeth on the table for rotating the latter with a step by step movement, a ratchet secured to said plate, a main operat ing shaft, a connection between the tamping element and operating shaft, a toothed disk carried by the operating shaft and adapted to engage the rack on the plate for raising the latter, a trough, a conveyer operating within the trough, and means for transmitting motion from the main operating shaft to the conveyer.

3. A molding machine including a supporting base, a mold supporting table mounted for rotation on the base with a step-by-step movement and provided with peripheral teeth, a tamping element movable to operative position within the mold, during each period of rest of the latter a plate slidably mounted on the supporting base, a pawl carried by the plate and adapted to engage the teeth on the table for rotating the latter, a spring bearing against one end of the plate, a rack carried by said plate, an operating shaft, a pitman forming a con nection between the operating shaft and tamping element, a trough, a feed screw mounted for rotation within the trough, and

means for transmitting motion from the main shaft to the feed screw.

4. A molding machine including a supporting base, a mold supporting frame mounted for rotation with a step-by-step movement on the base and provided with peripheral teeth, a vertically disposed frame arranged in the rear of the table, a carriage mounted for vertical movement on said frame, a tamping element carried by the carriage and normally locked against downward movement, means for feeding material to the mold, while the latter revolves a plate slidably mounted on the supporting base and provided with a pawl arranged to en gage the teeth on the table for rotating the latter, an operating shaft, a pitman forming a connection between the operating shaft and carriage for reciprocating the latter, and means for intermittently disengaging the tamping element from engagement with the carriage, thereby to permit the latter to move to operative position within the mold at each period of rest of the latter.

5. A molding machine including a mold carrying table, a frame, a carriage slidably mounted for vertical movement 011 the frame and including spaced longitudinal bars connected by transverse plates, a tamping element slidably mounted between the longitudinal bars of the carriage and provided with ratchet teeth, spring pressed pawls normally supported in engagement with the teeth of the tamping element, a main operating shaft, a connection between the operating shaft and carria 'e for reciprocating the latter, stop plates dlsposed in the path of move ment of the pawls for intermittently disengaging the latter from the teeth on the tamping element, thereby to permit the latter to drop by gravity within the mold, and means operable by said shaft for rotating the table.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

XVILLIAM OCONNOR.

WVitnesses:

JOHN M. KANE, JEAN DoWN. 

